Other than the simplistic, the British were our friends and allies. The US was also economically tied to the British war. JP Morgan was well-known to have helped finance the war effort in Britain and with a crumbling France and bankrupt Britain, there was economic pressure for the US to side with Britain to protect the economic interests of the wealthy. Additionally, Germany had not been helping themselves with the use of unrestricted submarine warfare and later the Zimmerman Telegram.
